global keyword is used to access global variables inside a function.
<?php
$x = 5;
$y = 10;
function myTest(){
global $x,$y;
$x = $x+$y;
}
myTest();
echo $x; //15
PHP stores all global variables in an array named $GLOBALS[index]. Index saves the name of the variable. This array can be accessed inside the function, or global variables can be updated directly;
The above example can be rewritten as follows:
<?php
$x = 5;
$y=10;
function myTest(){
$GLOBALS['x'] = $GLOBALS['x'] + $GLOBALS['y'];
}
myTest();
echo $x; //15
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